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Property, Equipment and Leasehold Improvements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Depreciation and amortization of property, equipment and leasehold improvements	$ 4,711	$ 4,411	$ 4,323

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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